Portable threading tool for threading opposite ends of a blank in a single operation



Aug. 19, 1958 w H. JACKSON 847,686

. 2 PORTABLE THREADING TOOL FOR THREADING OPPOSITE ENOS OF A BLANK IN ASINGLE OPERATION Filed July 19, 1956 2 Sheets-Sheet l INVENTOR. WalterH. Jackson ATTORNEY Aug. 19, 1958 Filed July 19, 1956 .Il I

y m lill-lu Ill-lill V W. H. JACKSON PORTABLE THREADING TOOL FORTHREADING OPPOSITE ENDS OF A BLANK IN A SINGLE OPERATION 2 Sheets-Sheet21 ATTORNEY United States Patent Olice Patented Aug. 19, 1958 PORTABLETHREADING TOOLLFOR THREADING ENDS OF A BLANK IN A SINGLEOP- Walter H.Jackson, Brooklyn, N. Y. Application July 19,V 1956, Serial No. 598,7938 Claims. (Cl. lll- 92) This'invention relates toa portable tool forthreading pipe nipples, studs, bolts, screws and the like.

It is the principal object of the present invention to provide a toolfor threading in a single operation both ends of pipe nipples or studs.

It is another object of theinvention to provide a threading toolwhereinboth ends of a nipple or stud may be threaded in one` operation, thatemploys standard xed type die tool head assemblies.

It is still another object of the invention to provide a threading toolin which the holder part is in the form of a sleeve or cylinder andwhich may beheld either in a fixed position in a vise or bench socketholder for hand operation or can be used with a lathe or other powerturning `device `for machine operation, and wherein the sleeve orcylinder serves as the aligning guide for Vthe threading dies andcarrier.

It is a further object of the' invention to provide in a pipe nipplethreadingtool` which has a guide inthe form of a central rod that passesupwardly inside the pipe nipple stock and holds the nipple stock: pieceagainst lateral` displacement and in proper position for accuratethreading` by the die assemblies and wherein the guide rod is supportedonan adjustable stop member which is adjustable tol limit the length ofthe thread on one end ofthe pipe nipple to the desired extent` andwherein the upper endof the rod passesthrough an adjustable guide andstop bushing device on the carrier to` limit the length of thread on theother end of` the pipe nipple carrier wherein provision is made topermit the replacement of one rod and its `guide bushing at the upperend by another rod and its guide bushing of another size so that' thetool isadapted for different size diameter nipples;

Itis still another object of the `invention to provide in antool forthreading pipe nipples, bolts, studs and the like a` atspring loaded:detent device for holding. the die assemblyagainst rotationin thecylindrical holder and so as to provide easy insertion of the dieassembly into the holder opening., and` its removal` therefrom withoutrequirng manual release and a similar detentfor use on the carrier:that. supports the rotatable die` onV the upper end of the tool and forconnecting the wrench to the die carrier shank.

It is a further object of the invention to provide in a portablethreading tool a sleeve liner ofvarious wall thicknesses, which can beplaced in the cylindrical body, in order to adapt the tool for differentdiameters of the die assembliesbearing the different size cuttingelements.

It is` a still further object o"f the invention to provide an4 externalguide devicefor threading tools that will engage the exterior of thestock piece so as to insure the proper starting ofthe lower end ofthepipe nipple or stud stock piece which is adjustable for .differentdiameters of pipes or studstockwhich is adapted to be quickly closed andreadily opened as soon as the stock` piece has become the .fulldownward? `passageof the movable die for 'the making of close nipplesand studs with threads extending to the center of the nipple or stud andwherein the external guide device can be completely removed as a unitfrom the tool assembly after removal of a spring retaining ring thatnormally holds it in place upon the cylindrical body. v

It is a still further object of the invention to provide a portable toolfor threading pipe nipples,l studs, bolts and the like which can bereadily converted from a tool adapted to thread pipe nipples or studs toa tool adapted to thread headed bolt pieces simply by replacing thebottom die with an assembly adapted to receive and retain the bolt headwhile the upper die is used to thread the bolt, the assembly beingadjustable to diierent size and shape of bolt heads,

Other objects of the invention are to provide a portable tool forthreading pipe nipples, studs, boltsand thel like, having the aboveobjectsin mind, which is of simple construction, is inexpensive tomanufacture, has a minimum number of parts, easy to assemble, durable,light in weight, can be carried by the mechanic in his tool kit,etlicientand effective in use.

For other objects, and for a better understanding of theinventiomreference may be had to the following detailed descriptiontaken in connection with the accompanying drawing, in which Figure l isa vertical sectional view of the cylindrical body holder of the portablethreading tool constructed according to one form of the invention, andthe standard die assemblies, movable die carrier and pipe nipple beingshown in full,

Fig.l 2 is a full vertical sectional view of the threading tool takenthrough the die assemblies, movable die carrier and nipple as viewed online 2-2 of Fig.. l,

Fig. 3` is a transverse sectional view of the threading tool takenthrough the upper die assembly carrier and showing in full the detentretaining devices for the dctachable connection of the carrier with theupper die assembly, as viewed on line 3 3 of Fig. 2,

Fig. 4 is a bottom plan view of the threading tool looking upon thesquared lower end adapted for retaining the tool in a vise or sockethaving aA square opening, whereby the body of the tool will be heldagainst turning movement while the thread ends are being cut upon thenipple,

Fig. 5 is a collective and perspective view of the parts of the hatspring detent retaining device that is` used to hold.v the lower die`assembly in the tool cylinder body, the upper die assembly in thecarrier andthe turn'mg wrench upon the shank portion of the die assemblycarrier,I so as to hold the die assemblies against rotation relative tothe tool holder body and the carrier, the wrench upon the carrier, andyet permitting their axial assembly upon one another or removaltherefrom,

Fig. 6 is an elevational View of the completely threaded nipple removedfrom the tool,

Fig. 7 is an elevational View of the nipple and stud threading toolconstructed accordingV to another form of the invention in which theydie assemblies .are arranged for threading a short stud and which has.an external retractable centering Work device for holding the studwhile it is being started in the lower die assembly with portions of.the tool being broken away to show the interior of the tool and toolbeing mounted on a socket holder iixed to a bench and the tool beingmade ready for use, y

Fig. 8 is a transverse sectional view` of` the latter threading toollooking downwardly upon the external Work centering device and as viewedon lines l8 8` of Fig. "7', and

Fig. 9 is a transverse sectional View tak'en through the threading tool`and the external work centering device', theview being taken on line9-9` of Fig. `7',

Fig. is a top plan View of a holder for a bolt head adapted to replacethe lower die 75 in the body 74,

Fig. ll is an elevational view of the bolt holder shown in Fig. 10 withportions broken away to show the interior construction thereof, and

Fig. l2 is a plan View of an adaptor for the holder for ,use with squareheaded bolts.

Referring now particularly to Figs. l to 5, represents the main holderbody in which internal working parts of the tool are assembled. Thismain body has a squared bottom end portion 16' for attaching the tool toa vise or a socket holder 17, Fig. 7 having a square opening therefor.This socket holder may be xed by bolts 18 and 19 to a bench 20. The mainholder body 15 also has an upwardly-extending cylindrical wall portion21 with vertically-extending elongated openings 21 through which thethread cuttings can be dispensed. The cylindrical wall portion has anotch 22 in its upper end adapted to receive a pin 23 in the upper endof a sleeve liner 24y to hold the liner against rotation therein and itsvertically-extending elongated slots 24 in alignment with the slots 21'in the body wall 21. This liner provides an inner wall guiding surfacefor lower and upper die assemblies 25 and 26 and a carrier 27 thatcarries the upper die assembly 26. Alternative liners 24 of differentradial thicknesses can be used to adapt the tool for the different sizedie assemblies. The liner sleeve 24 can also be removed to accommodatethe larger diameter size die assemblies. Thus, the tool can be adaptedto thread different size nipples.

Extending through the main body 15 and the squared end is a centralopening 28 which has a threaded portion 29. This opening 28 has anadjustable plug 30 in the threadedportion 29 into which a stop member 31is threaded as indicated at 32. The upper end of stop member 31 has athreaded recess 33 adapted to receive the threaded lower end of a guiderod 34 onto which a nipple blank 35 is placed to be centered in thelower die assembly 25 lying in the bottom of the cylindrical wallportion 21 of the main body 15.

The lower die assembly comprises a body 36 having a plurality of threadcutting elements 37 nested therein with their cutting faces engaging theend of the nipple blank to cut the thread thereupon as the nipple blankis turned. The body 36 has a depending reduced diameter shank portion 38that has a plurality of angularlyspaced, vertically-extending elongatedrecesses or indentations 39 on the exterior thereof.

A detent assembly 40 as shown in Figs. l and 5, is engageable with therecesses 39, is provided in the body 15 to releasably hold the lower dieassembly 25 in place in the body 15 against rotation. This detentassembly 40 comprises three parts, namely, an inner plug part 41, a flatspring 42 and a threaded adjustable plug 43. The inner plug part 41 isgenerally of cylindrical shape and has a narrow projection 44 ofrectangular section that enters opening 28 and engages any one of therecesses 38 on the depending shank portion 38. The recesses 38 and endof the projection 44 are rounded to permit easy insertion or removal ofthe die 25 from the body 15. The other end of the inner part 41 is roundand of semi-spherical shape as indicated at 45. The threaded plug 43 hasa cylindrical recess 46 in the front end face thereof conforminggenerally in radius to the spherical end face 45 of the part 41.Centrally of the cylindrical end recess 40 is a further recess 47yadapted to receive and guide the at spring 42. The at spring 42 has atendency to be straightened and will urge the plug body 41 and itsprojection 44 into engagement with one of the elongated recesses 39. Onthe end of the screw plug 43 is a slot 48 adapted to accommodate a screwdriver for effecting the adjustment of the thread plug 43 and the springpressure.

The upper die assembly 26 is a standard die assembly and the same as thelower die assembly 25. It has a main body 51 containing cutting elements52 in nested relationship to thread the upper end of the pipe nippleblank 35. The main body 51 of this die assembly has anupwardly-extending shank portion 53 with a plurality ofangularly-spaced, vertically-extending elongated recesses 54. The upperdie carrier 27 has opposing detent assemblies 55 and 56, similar to theassembly already described and shown in Fig. 4, which engage with therecesses 54 to hold the upper die assembly 26 against rotation withinthe carrier and against downward axial displacement therefrom.

The die carrier 27 has an elongated upstanding shank 57 that hasangularly-spaced elongated recesses 57 adapted to receive a detentassembly 58 of a turning handle ring 59 that is tted over the shank 56and which has a handle 60 extending laterally so as to apply adequateturning torque upon the carrier 27 and the cutting action of the nipplethreading die assemblies 25 and 26.

The shank portion 57 of the carrier 27 has `internal threads 6'1 andreceives an adjustable sleeve 62 having a squared wrench engagingportion 6'3 at its upper end. The guide rod 34 for the nipple 35 slidesupwardly through the sleeve 62 as the carrier and the upper die assembly26 is turned downwardly upon the nipple 34. Threaded into the lower endof the sleeve 62 is a stop sleeve 64 with which the end of the nipple 35engages to limit the downward cutting action upon the nipple. The sleeve63 and the stop sleeve 64 is adjustable to different elevationsdepending upon the length of thread desired upon the upper end of thenipple 35.

In order to place the nipple 35 into the device, the carrier 27 and theupper die 26 `is removed and nipple blank 35 is slid downwardly over theguide rod 34 and centered in the lower die assembly `25. The upper dieassembly 26 and the carrier is put into the liner sleeve 24 over theupper end of the guide rod -34 and into the liner sleeve 24 so that thedie assembly 26 engages the upper end of the nipple blank 35. With thewrench 59 the carrier 27 and the upper die 26 is turned so as to startthe threading action upon the opposite ends of the nipple blank 35. Oncethe threads have been started upon the opposite ends of the nipple blankthe turning motion is continued to complete the threads on both'ends ofthe nipple until the lower end of the stop sleeve 64 engages with theupper end of the nipple blank 35 and the upper end of the stop member 31engages with the lower end of the nipple blank 35. Thereafter, thecarrier 27 and the upper die 26 is rotated in the reverse directionuntil the same has been made free ofthe threaded nipple. Thereafter, thenipple if detached from the lower die can be removed and another nippleblank placed over the guide 34 to be threaded. If the nipple is notreadily detached from the lower die 25 the lower die can be removed fromthe body of the tool and the nipple extracted from the die withappropriate tools. The finished nipple 35 will have threaded portions 35and 35" on the opposite ends of the same, Fig. 6. To adapt the tool formaking diierent size nipples diierent size liner sleeves 24 and dieassemblies can be placed into the body 15. These die assemblies arestandard threading dies., rIhe stop member 31 and the guide rod 34 canbe replaced by another stop member and another guide rod. Similarlyanother stop sleeve 64 can be applied to the adjustable sleeve 63.

Referring now to Figs. 7, S and 9, 70 represents a main holder bodywhich has a squared end portion 71 adapted to be inserted `in the holder17. This main body 70 has a shoulder 72 for supporting an external blanknipple or stud guiding device 73 and a cylindrical wall portion 74extending upwardly therefrom. In the lower end of the cylindricalportion is a lower die assembly 75, into which a blank stud 76 isplaced. An upper die assembly 77 and its carrier 78 is placed over thestud and into the cylindricalportion. This carrier 78 has a shankportion 79 to which the wrench 59 is attached inthe same'mam ner asabove described and in which there is an adjustable sleeve 80`with` anadjusting wrench-engaging por tion 81 adapted to adjust the sleeve fordetermining the length of thread to be made on the upper end of thestud. A 'liner sleeve 82 fitted into the cylindrical portion 74 servesas a `guide for thedles; This sleeve has a pin 83 at the upper endthereof 'that enters a notch 84 inthe upper end of the portion 74' so astohold the sleeve against rotation as the upper die 77 is turned tothread the stud.

The external guiding device 73 is` located as near to the upper face ofthe lower die '75 "'so as to permit even the shortest studs to be guidedinto the lower die 75. This guiding device 73 is held against upwarddisplacement from the shoulder 72 by a spring retaining ring 85 that isseated in an annular recess on the external surface of the cylindricalportion 74.

This guide device or mechanism 73 comprises an external ring 87 that hasa plurality of angularly-spaced arcuate involute portions 88, 89 and 90adapted to fit respectively into any one of a plurality oflongitudinally spaced recesses 91 of any of the radially-adjustableguide elements 92, 93 and 94 which extend through angularlyspacedopenings 95, 96 and 97 in the cylindrical wall 74 and in respectiveregistered openings of the liner sleeve 82 and are adapted to be alignedwith the center of the stud 76 so that their inner curved ends may belocated to center the stud in the lower die and hold the same during theinitial part of threading operation.

The annular member 87 has a laterally-extending handle arm 98 which isgrasped to turn the ring 87 so that as the ring is turned the guideelements 92, 93 and 94 may be either contracted or expanded. The guideelements are retracted preferably to an extent to clear the inner wallsurface of the sleeves 82 so as to permit the removal of the lower dieassembly 75. As soon as the stud has been started into the lower die,the guiding elements 92, 93 and 94 can be expanded. When the elementsare expanded suciently the upper die can be moved p downwardly throughthe liner sleeve 82 to the lower die so as to provide a close threadednipple or stud.

Referring now particularly to Figs. 10, 11 and l2, 100 represents aholder that `is adapted to replace the lower die 25 or 75 of the abovedescribed nipple cutting tools. This holder has a top recess 101 and adepending shank 102 with vertically-extending elongated recesses 103 inthe external surface thereof. The holder has a set screw 104 that can betightened upon the holder and extended into an adaptor block 105 whichhas an hexagonal recess 106. A bolt 107 is inverted and its head 108 isinserted in the recess 106 so that its shank extends upwardly to beengaged by the upper die assembly 26 or 77. The block 105 has a ilatside 109 that is aligned with a straight side 110 of the recess 101 sothat the block 105 is kept from turning while the thread is being turnedupon the bolt 107. The set screw 104 will hold the block 105 againstoutward displacement therefrom. In Fig. 12, there is shown a block 112adapted to similarly lit in the recess 101 and which has a screw opening113 for receiving a squared head of a bolt. This block has a flat side114 with a screw opening 115 therein for receiving the set screw 104.

lt will be apparent that other blocks can be provided in which there aredilerent shape and size openings for other size and shape bolt heads.With the holder 100 in place in the body of the tool and with the boltprojecting upwardly therefrom the upper die 26 or 77 can be disposed inthe body of the tool and turned onto the bolt and place a threadthereon.

It should now be apparent that there has been provided a pipe nipple orstud threading tool which is adaptable for diiferent size diameters ofnipples and studs and wherein standard die assembles can be used. Itwill also be apparent that this tool can either be held in a vise orsocket while the carrier for the upper die assembly is turned so thatthe machine can be readily adapted for lathe operations by connectingthe holder to a fixed part of the lathe and the carrier to a rotatingchuck.

While various changes may be made in Athe detail construction, it shallbe understood that such changes shall be within the spirit and scopeofthe present invention as defined by the appended claims.

What is claimed is:

l. A portable tool for threading pipe nipples, stud bolts 'and the likecomprising `a hollow body having a depending shank portion adapted ltobe secured to a socket or vise, said hollow body'being open at the topand hav-` ing a central opening depending" from the bottom thereofwithin the shank portion, a lower die assembly resting in the bottom ofthe hollow body and having a shank extendl ing into the central opening,releasable means on the body engageable with the shank of the dieassembly to hold the same against rotation, means associated with saidbody to hold a blank piece centered upon the lower die, an upper diecarrier, an opposing upper die having a shank extending into thecarrier, releasable means on the carrier and engaging with the shank ofthe upper die to hold the upper die against rotation relative thereto,and against downward displacement therefrom, said carrier and upper dieadapted to be slidably tted into the open end of the hollow body so thatthe die will engage the upper end of the blank piece, said carrierhaving an upwardly-extending shank and a turn handle associated withsaid shank by which the carrier, the upper die and the blank piece canbe turned, whereby to eiect the cutting of threads upon both ends of theblank piece.

2. A portable tool for threading nipples, stud bolts and the like asdefined in claim l, and. said means for holding the blank piece centeredupon the lower die and within the tool comprising a guide rod extendingupwardly from the central opening in the bottom of the tool holder andthrough the upper die and into its carrier.

3. A portable tool for threading nipples, stud bolts and the like asdened in claim l, said releasable means for securing the lower die inthe bottom of the hollow body including recesses in said shank of saidbottom die and detent means in the body engageable with said recesses ofthe shank of the lower die and said upper die having a shank extendinginto said carrier and detent means on said carrier engageable with saidshank to hold the upper die in the carrier against rotational andvertical downward displacement with respect thereto, said carrier havingrecesses in its upwardly-extending shank portion and said turn handlehaving a detent releasably connecting said turn handle with said shankto engage with the shank and cause the turning of the carrier and upperdie as the handle is turned.

4. A portable tool for threading nipples, stud bolts and the like asdeiined in claim l, and a replaceable liner sleeve adapted to be ttedinto the hollow body and means engageable therewith to lock the sameagainst rotational adjustment therein.

5. A portable tool for threading nipples, stud bolts and the like asdefined in claim 1, and said means for centering the lower end of theblank piece in the bottom die comprising an annular plate surroundingsaid hollow body externally thereof and having curved arcuate camprojections angularly spaced thereon and depending from the underfacethereof, radially' extending blank piece engaging elements radiallyslidable through the sides of the hollow body and adapted to engage withthe blank piece to center the same in the lower die, said radiallyadjustable elements having grooves for receiving said cam projectionsand upon the ring being turned one way or the other the radial elementswill be contracted or expanded into and out of engagement with the blankpiece.

6. A portable tool for threading nipples, stud bolts and the like asdefined in claim 1, and .adjustable stop means in the central dependingopening of the central body adapted to he engaged by the blank piece tolimit the length of the threads on the lower end thereof and' adjustablestop means on the carrier and engageable by the upper end of thev blankpiece to limit the length of the threads on the upper end of the piece.v

7. A portable tool for threading nipples, stud bolts and the like asdefined in claim 6, and said means 'for holding the blank piece centeredincluding a guide rod carried on the adjustable stop means in the bottomof the hollow body and adjustable therewith within the central openings,said adjustable stop means on the carrier including a stop sleeve andsaid guide rod extending through the sleeve and thereby held in lateraldisplacement Within the tool.

8. A portable tool for threading nipples, stud bolts and the like asdened in claim 7, andV said central opening being threaded and said stopmeans including a plug threadedly adjustable in said central opening,said shank on said carrier being internally threaded, said adjustablestop means in said carrier including a threaded sleeve adjustable in thecarrier shank and a stop sleeve carried by saidadjustable sleeve.

No references cited.

